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Old 12-03-2010, 10:30 AM   #1
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Gearing for 33's?

Well I just got 33's put on my YJ it look so bad ass.....BUT I can only do about 60. My jeep is daily drivien I don't rock crawl either " NO WHERE TO GO" The only thing my jeep see's is mostly highway, a little mud and the beach. From what I've read I need either 4.10s or 4.56 gears. I have the ax/15 and the I6 the jeep is a 1993. Which gear set would be better for my application I wan't it to be geared to drive as close to stock as possible.

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Old 12-03-2010, 10:39 AM   #2
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4.56 is perfect for your combo

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Old 12-03-2010, 10:49 AM   #3
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Okay so It won't be super low geared. I'd like to keep my rpms around 2000-2300 rpms while doing 70 in OD.
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Old 12-03-2010, 10:50 AM   #4
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no it will be fine....actually it will be lower rpm than that at 70 in OD
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Old 12-03-2010, 10:59 AM   #5
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Thanks for the info for future refrence will 4.56 gears work with 35's
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Old 12-03-2010, 11:05 AM   #6
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I sure they will, I've never run them personally, but I have run 38's on 4.56's with a v8 and its still pretty decent
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Old 12-03-2010, 11:41 AM   #7
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4.56 is perfect for your combo
x2
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Old 12-03-2010, 12:05 PM   #8
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Gear Calculator

just put in stock numbers and then the new stuff.
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Old 12-03-2010, 12:09 PM   #9
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Originally Posted by Ibuildembig
4.56 is perfect for your combo
I ran 33s with 456 now I run 35s works great for both my fuel
Milage went from 18 with 33s to 16 with 35s
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Old 12-03-2010, 01:24 PM   #10
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Well, the question still remains: What gears do you have right now?

I know there is a formula out there that you can use to get the same kind of drivability before the change in tire size. So what size tires did you have before, and were you satisfied with the acceleration and "top speed".

From what you said about you don't rock crawl and you see mostly highway you probably want to keep the gears in the lower range for your 33's. As they will keep your rpm's lower thus saving some gas. Saying this I have 33's the I6 and a NV3550(close to same overdrive gear) and 3.73 in the axles. Highway driving is ok for the most part but I have close to no acceleration at 65 and I have to down shift at most of the inclines. I feel like 4.10's would do my highway driving perfect but, I do rock crawl, my license plate is RKCWLR, so I better crawl. I am planning for 4.56's though, I also have plans for 35's in the future which will fit the 4.56 well.
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Old 12-03-2010, 01:32 PM   #11
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well considering this is a YJ thread and he has an ax15 in a 93, the only gears he could have from the factory are 3.08's. Screw the formula, 4.56's are the way to go ....speaking from experience
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Old 12-03-2010, 01:34 PM   #12
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Okay so It won't be super low geared. I'd like to keep my rpms around 2000-2300 rpms while doing 70 in OD.
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no it will be fine....actually it will be lower rpm than that at 70 in OD
I'm not so sure about that. I have 3.73 with 33's and my RPM's are about 2100 or so at 70
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Old 12-03-2010, 01:37 PM   #13
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well considering this is a YJ thread and he has an ax15 in a 93, the only gears he could have from the factory are 3.08's. Screw the formula, 4.56's are the way to go ....speaking from experience
I understand it is a YJ thread, the ax15 and the nv3550 have very similar OD gears .79 and .78 respectively. And the engine is the same more or less.
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Old 12-03-2010, 01:48 PM   #14
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Then why the question of his starting gear ratio? There's only one choice in 1993 with a 6 cylinder. I wasn't thinking correctly when I said it was lower, its a bit higher than stock, but its not gonna make that much difference in mileage...mine still got 14 mpg. Stock rpm with stock tires at 70 is 2457....33's and 4.56's is 2535
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Old 12-03-2010, 01:58 PM   #15
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Then why the question of his starting gear ratio? There's only one choice in 1993 with a 6 cylinder. I wasn't thinking correctly when I said it was lower, its a bit higher than stock, but its not gonna make that much difference in mileage...mine still got 14 mpg. Stock rpm with stock tires at 70 is 2457....33's and 4.56's is 2535

Well I am not familiar with YJ stock gearing options. And that question was still a good one. if he liked the feel he got with 3.09's and 29's, 4.10's and 33's would be closer to stock than 4.56?

Just so you know I agree with you that 4.56 would be a better ratio if he may plan to go bigger some day. It's one of those things you should try to do only once. Because of the big price tag.
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Old 12-03-2010, 03:03 PM   #16
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93 YJ 6cyl ax-15 33's with 4.56 gears here. Great setup. About 2400 rpm at 70mph. They sell good quality gear kits for front and rear fairly cheap. 4.56 is the way to go.
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Old 12-04-2010, 11:42 AM   #17
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93 YJ 6cyl ax-15 33's with 4.56 gears here. Great setup. About 2400 rpm at 70mph. They sell good quality gear kits for front and rear fairly cheap. 4.56 is the way to go.
That was my next question I'm a newb Jeeper What parts do I need for the regearing, obviously two ring and pinion sets but is there any other hard parts?
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Old 12-04-2010, 11:47 AM   #18
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That was my next question I'm a newb Jeeper What parts do I need for the regearing, obviously two ring and pinion sets but is there any other hard parts?
Yes, there are install kits you must get. The basic ones come with shims to position the ring and pinion properly as well as a seal and bearing for the pinion. Though with your year of vehicle and the low posibility that they have been changed I would suggest a full install kit that comes with every seal bearing and shim you could need. They replace the bearing and seals on the axle shafts and freshens up your whole axle. With a much less likely hood of a leak.
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Old 12-04-2010, 11:48 AM   #19
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That was my next question I'm a newb Jeeper What parts do I need for the regearing, obviously two ring and pinion sets but is there any other hard parts?
It's a good idea to replace bearings and seals when you have it apart. The carrier must also be replaced if stock gears are smaller than 3.73. Regearing is not an afternoon job for a beginner.
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Old 12-04-2010, 11:56 AM   #20
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It's a good idea to replace bearings and seals when you have it apart. The carrier must also be replaced if stock gears are smaller than 3.73. Regearing is not an afternoon job for a beginner.
I will for sure not be the one swapping the gears lol. I was just gonna order parts if I can get them cheaper than the mechanic. I was Told if I bought the gears he would install them for $200 per axle is this a good price .
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Old 12-04-2010, 11:57 AM   #21
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I will for sure not be the one swapping the gears lol. I was just gonna order parts if I can get them cheaper than the mechanic. I was Told if I bought the gears he would install them for $200 per axle is this a good price .
Yes very good.
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Old 12-04-2010, 12:00 PM   #22
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Also should I upgrade my rear axle as I hear they break with bigger tires. I've been looking at the alloy usa rear axle kit is this good enough for 33-35" tires or do I need to get a whole new axle. I see a ford explorer at a near buy junk yard???????????
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Old 12-04-2010, 12:02 PM   #23
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What rear axel do you have?
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Old 12-04-2010, 12:08 PM   #24
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What rear axel do you have?
Stock Dana 35
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Old 12-04-2010, 01:50 PM   #25
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Use the Superior Axel 30 spline Super 35. Will hold up to 35" tires just fine doing serious wheeling. If extreme wheeling is your thing upgrade to an 8.8 or D44.
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Old 12-04-2010, 04:13 PM   #26
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No I dont extreme wheel just occasional beach driving and mudding.
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Old 12-04-2010, 09:50 PM   #27
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Same topic not sure if its already been answered but I have a 2005 TJ 2.4L with a 4" lift on 31" I eventually want to run 35" but it has everything else stock such as dana 30 and dana 35 rear end 3:73 gears (honestly i have no clue what that means) tryin to learn about the whole mod thing but i spoke with some one and said I need 4:88 gears i had a frend who had a 97 2.4 wit 4:88 on 36" but he was a hard core rock crawler "im not" but want it to run decent and if i want to take it off road then want it to do good. And if i go with 4:56 or 4:88 what does the whole locker rear end thing mean is that the whole thing with rear gearing or would I have to buy something seperate to "lock" the rear end's
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Old 12-04-2010, 10:27 PM   #28
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Use the Superior Axel 30 spline Super 35. Will hold up to 35" tires just fine doing serious wheeling. If extreme wheeling is your thing upgrade to an 8.8 or D44.
You could buy 4 8.8 axles and then some for the price of a super 35
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Old 12-05-2010, 09:03 AM   #29
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I am not lucky enough to live in a place where they give away 8.8 axels. The cheapest I have found is $275. You could just put that axel with 4.10's in and call it good. That is by far the cheapest way to go. If you only want to regear and no locker it is still cheaper than a S35. If you plan on replacing all bearings, seals, carriers, gears and adding a locker the final cost is very close depending on where you have it done and it is less work. A lot of people are lucky and find 8.8 and D44 for next to nothing. I am not that lucky.
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Old 12-05-2010, 09:11 AM   #30
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275's not bad if its complete with limited slip. Even with a regear and locker its still very close in price to a super 35. If I were doing it, I would use the 8.8 and not look back....or, step up to its daddy...the 10.25

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